Evaporation and Boiling
Chemistry ⇒ States of Matter
Evaporation and Boiling starts at 7 and continues till grade 12.
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See sample questions for grade 11
A 50 mL sample of water is left in an open dish in a room at 30°C and 40% humidity. If the humidity increases to 80%, what will happen to the rate of evaporation?
A beaker contains 100 mL of water at 25°C. If the surface area is doubled, what happens to the rate of evaporation?
A liquid is heated in a closed container. What happens to the boiling point as the vapor pressure inside increases?
Describe the role of intermolecular forces in determining the boiling point of a liquid.
A 50 mL sample of water is left in an open dish in a room at 30°C and 40% humidity. If the humidity increases to 80%, what will happen to the rate of evaporation?
A beaker contains 100 mL of water at 25°C. If the surface area is doubled, what happens to the rate of evaporation?
A liquid is heated in a closed container. What happens to the boiling point as the vapor pressure inside increases?
Calculate the boiling point of water at 0.8 atm, given that the normal boiling point is 100°C at 1 atm. (Assume the boiling point decreases by about 10°C for every 0.2 atm decrease in pressure.)
Which of the following best describes the energy change during evaporation? (1) Energy is absorbed from the surroundings. (2) Energy is released to the surroundings. (3) No energy change occurs. (4) Energy is created.
Which of the following best describes why evaporation is a cooling process? (1) The fastest molecules escape, lowering the average kinetic energy. (2) The slowest molecules escape, raising the temperature. (3) All molecules escape at the same rate. (4) The process releases heat to the surroundings.
Which of the following best explains why sweating cools the body? (1) The sweat absorbs heat as it evaporates. (2) The sweat reflects sunlight. (3) The sweat increases body temperature. (4) The sweat blocks pores.
Which of the following factors does NOT affect the rate of evaporation? (1) Surface area (2) Humidity (3) Atmospheric pressure (4) Color of the liquid
Boiling occurs when the ______ pressure of the liquid equals the atmospheric pressure.
Evaporation is the process by which a liquid changes into a ______ at temperatures below its boiling point.
Fill in the blank: The ______ point of a liquid is the temperature at which its vapor pressure equals the external pressure.
Fill in the blank: The rate of evaporation of a liquid increases when the ______ of the liquid is increased.
True or False: Boiling is a surface phenomenon, while evaporation is a bulk phenomenon.
True or False: Evaporation can occur at temperatures below the freezing point of water.
True or False: Evaporation increases with an increase in humidity.
True or False: The boiling point of a liquid decreases as atmospheric pressure decreases.
